Worm hob for gear cutting



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M. u. RAMSAY ET AL WORM HOB FOR GEAR CUTTING F1166 April 18, 1922 ill) Patents Get. 23, 1924.

UK T

MAB/GEL 'UlLYSSE RAMSAY AND DESIRE MARIE MOEGLEN, 0F BOIS-COLOMBES, FRANCE.

WORM HOB FOR GEAR'CUTTIING.

Application filed April 18, 1922. Serial No. 555,292.

To all whom it may concern:

Be it known that we, MARCEL ULYSSE RAMsAY and DESIRE MARIE MoEcLnN, respectively citizens of the Swiss Republic and of the French Republic residing at Bois- Colombes, Seine, in the l iepublic of France, have invented new and useful Improvements in Worm Hobs for Gear Cutting, of which the following is a specification,

The present invention has for its object a worm hob for the cutting of gears which is especially noteworthy in that it comprises two sets of helical grooves inclined in opposite directions with reference to the helix of the worm hob thread, the intersection of these helical grooves with the sides of the threads of the Worm hob determining the cutting edges of the tool, so that the teeth succeeding each other on the thread of the worm hob will work alternately to the right and left whereby the cutting and the disengagement of the chip are facilitated.

In the accompanying drawing given by way of example:

Fig. 1 shows in perspective a worm hob for gear cutting constructed according to this invention.

f Fig. 2 is a development of its lateral surace.

The worm hobforming the object of this invention (Figs. 1 and 2) comprises two ,to the right and left which facilitates the cutting and the disengagement of the chip. Having now described our invention, what we claim as new and desire to secure by Letters Patent is:

A worm hob for cutting gear teeth comprising a worm thread and two sets of helical grooves of opposite senses and greater pitch than the worm, the cutting edges being constituted by the intersectidn of the side faces of the said Worm thread with said helical grooves, whereby the teeth succeeding each other on the worm thread will work alternately to the right and the left.

In testimony whereof we have signed our.

names to this specification.

MARCEL ULYSSE RAMSAY. DESIRE MARIE MOEGLEN. 

